Indeed, it is not insulated on the bottom, I have it sitting on top of a burner. I do get heat loss from the equipment, was much worse before I wrapped it, 1 degree per 5-7 minutes.
How I got here was that I add about 1/4 - 1/2 gallon of water to my grains before crushing and let it sit for an hour (the crush turns out quite differently as grains are more squished than crushed, I like it), but failed to account to this extra volume when calculating strike temps. For this reason as well as wanting a bit more control (I'm in a cold windy coastal area), I needed the ability to heat the mash. The heat / viscosity issue has me wondering what the science is.
Recirculating the mash - do you use a pump for that? Any recommendations?
Thanks again all.